On this day in 1572 – November 6th – Tycho Brahe recorded a bright new star, supernova SN 1572) in the constellation Cassiopeia.
Tycho's study showed that it wasn't a local phenomenon, but a distant star. This was completely contrary to the understanding of the time that the stars were part of sphere which was perfect and unchangeable.
Last edited by Mona - Astronomy; 11/23/1704:52 AM.
On this day in 1875 – November 11th – Vesto Slipher was born.
Slipher was an American astronomer, and director of the Lowell Observatory in Arizona. He was the first to discover the redshift of galaxies when he measured their velocities - this laid the foundation for Hubble's later work.
Last edited by Mona - Astronomy; 11/23/1704:49 AM.